Never heard of a Hass that is that size and called mature. I have a "Mexicola"..and that for sure passes as a small sized Avocado tree. But its just a few years young..10 year,20 years from now i dont know what size it would be without pruning. And pruning may be done-read the lichee theives post. Whats the point of letting a tree grow over the fence when you will be last to the fruit?..

I believe the tag has the wrong information on it. If you want a dwarf avocado, try Holiday. I saw the same tag on the Hass avocado here in San Diego and my friend actually bought the tree thinking it will stay small. I did some searches on Google and didn't find any info on dwarf Hass Avocados.